chore(lint): relinted code base according to strengthened rules.

[fredbi]

Following the refactoring of error switch statements, added tests cases to cover all new code branches.

NOTE: remember not to apply the auto fix for errlint, as it embarks into ambitious code rewrites that are broken.

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b1b6a71) to head (a04ecbb).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #79   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          521       535   +14     
=========================================
+ Hits           521       535   +14     

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